Pre-lab 2 320 - Megan Gueli 11638200 MVS 320 Wednesday...

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Megan Gueli 11638200 MVS 320 Wednesday 5-7pm Lab 2: Static and Dynamic Postural Control
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Module 1: Introduction: Static control is the position of the body in space to maintain balance and orientation. The central nervous system works to keep the body’s center of mass within the base of support. During static contraction the opposing muscles work to maintain the desired position. The purpose of this module is to examine how changes in the base of support (BOS) and manipulations of the sensory feedback affects postural stability. It is expected that the sway of the ankles will measure about 5 to 7 mm in the anterior- posterior direction and 3 to 4 mm in the medial-lateral direction. It is predicted that postural stability with increased with a greater base of support, therefore two legged- stance, and sensory feedback will be heightened with eyes open and on a flat surface. Methods: Center of pressure will be used to quantify postural stability using a force plate. The COP can vary within the sagittal and frontal directions due to sway stemming from the ankle. Sway will be measured from COP data. We will be measuring Anterior- Posterior and Medial-Lateral displacement. We will be measuring two BOS configurations, one position with standing on two legs, and the other standing on one leg. Also, two different surfaces will be used flat and rigid compared with uneven and compliant. Data will be collected using the AMTI software programs attached to the force plate. Results: 2
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In Anterior-Posterior average displacement increased with variables. For example when eyes are closed more displacement in the anterior-posterior direction was found. Also, a single stance versus double stance increased displacement, likewise when balancing on the foam surface a greater displacement was observed than on the force plate alone. Specifically, as can be seen in figure 1 on double stance with the eyes open
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This note was uploaded on 03/15/2012 for the course MVS 320 taught by Professor Drew during the Fall '11 term at University of Michigan.

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Pre-lab 2 320 - Megan Gueli 11638200 MVS 320 Wednesday...

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